Chemicals and advanced nanomaterials producer Graphene Nanochem has reached an agreement with water treatment system developer HMV.Graphene has announced it will collaborate with the Singapore-based firm to design and commercialize the PlatClean V1 System, a graphene-enhanced water treatment system for the oil and gas industry.Shares of the Malaysia-based company were 1.77% up to 47.19p at 15:27 on Monday.